Abstract
Two deltaproteobacterial sulfate reducers, designated strain I.8.1T and I.9.1T, were isolated from the oxygen minimum zone water column off the coast of Peru at 400 and 500 m water depth. The strains were Gram-negative, vibrio-shaped and motile. Both strains were psychrotolerant, grew optimally at 20°C at pH 7.0–8.0 and at 2.5–3.5% NaCl (w/v). The strains grew by utilizing hydrogen/acetate, C3–4 fatty acids, amino acids and glycerol as electron acceptors for sulfate reduction. Fumarate, lactate and pyruvate supported fermentative growth. Sulfate, sulfite, thiosulfate and taurin supported growth as electron acceptors. Both strains were catalase-positive and highly oxygen-tolerant, surviving 24 days of exposure to atmospheric concentrations. MK6 was the only respiratory quinone. The most prominent cellular fatty acid was iso-17:1-ω9c (18%) for strain I.8.1T and iso-17:0-ω9c (14%) for strain I.9.1T. The G+C contents of their genomic DNA were 45–46 mol%. Phylogenetic analysis of 16S rRNA and dsrAB gene sequences showed that both strains belong to the genus Desulfovibrio. Desulfovibrio acrylicus DSM 10141T and Desulfovibrio marinisediminis JCM 14577T represented their closest validly described relatives with pairwise 16S rRNA gene sequence identities of 98–99%. The level of DNA-DNA hybridization between strains I.8.1T and I.9.1T was 30–38%. The two strains shared 10–26% DNA-DNA relatedness with D. acrylicus. Based on a polyphasic investigation it is proposed that strains I.8.1T and I.9.1T represent a novel species for which the name Desulfovibrio oceani sp. nov. is proposed with the two subspecies D. oceani subsp. oceani (type strain, I.8.1T = DSM 21390T = JCM 15970T) and D. oceani subsp. galateae (type strain, I.9.1T = DSM 21391T = JCM 15971T).
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Abbreviations
- SRB:
-
Sulfate-reducing bacteria
- dsrAB :
-
Genes (dsrA and dsrB) encoding the alpha and beta subunit of dissimilatory bisulfite reductase
- DSMZ:
-
Deutsche Sammlung von Microorganismen und Zellkulturen (Braunschweig, Germany)
- OMZ:
-
Oxygen minimum zone
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Acknowledgments
We thank Tove Wiegers and Trine S. Thomsen for expert technical assistance. We are grateful to the Identification Service of the Deutsche Sammlung von Mikroorganismen und Zellkulturen for performing the DNA-DNA hybridization analyses. The authors gratefully acknowledge the advice given by Professor Euzéby in naming the isolates. The master and the crew onboard the Danish Naval vessel “Vædderen” are thanked for their help and hospitality. Sample collection was carried out during the Galathea 3 expedition under the auspices of the Danish Expedition Foundation. This is Galathea 3 contribution P54. This study was supported by SNF Grant No. 272-05-0363 and Carlsbergfondet 2007010316.
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The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA and the dsrAB gene sequences for strain I.8.1T are FJ655907 and FJ655910; and FJ655908 and FJ655911 for strain I.9.1T. Furthermore, the 16S rRNA gene sequence of Desulfovibrio desulfuricans subsp. aestuarii NCIMB 9335T and the dsrAB sequence of Desulfovibrio acrylicus DSM 10141T were determined in this study and deposited under the GenBank/EMBL/DDBJ accession numbers FJ655909 and FJ655912, respectively.
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Finster, K.W., Kjeldsen, K.U. Desulfovibrio oceani subsp. oceani sp. nov., subsp. nov. and Desulfovibrio oceani subsp. galateae subsp. nov., novel sulfate-reducing bacteria isolated from the oxygen minimum zone off the coast of Peru. Antonie van Leeuwenhoek 97, 221–229 (2010). https://doi.org/10.1007/s10482-009-9403-y
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DOI: https://doi.org/10.1007/s10482-009-9403-y